false indigo bush

Amorpha fruticosa is a perennial shrub. It grows as a glandular, thornless shrub which can reach 5 or 6 m (16 or 20 ft) in height and spread to twice that in width. It is somewhat variable in morphology. The leaves are made up of many hairy, oval-shaped, spine-tipped leaflets. The inflorescence is a spike-shaped raceme of many flowers, each with a single purple petal and ten protruding stamens with yellow anthers. The fruit is a legume pod containing one or two seeds.

The native range extends through much of the United States and south into Mexico. Its native habitats include stream and pond edges, open woods, roadsides and canyons. The species has escaped cultivation elsewhere and is present as an introduced species in Europe, Asia, and other continents. It is often cultivated as an ornamental plant, and some wild populations may be descended from garden escapes.

It is a larval host to the clouded sulphur, gray hairstreak, hoary edge, Io moth, marine blue, silver-spotted skipper, and southern dogface. The plentiful seeds are a food source for bobwhite quail. Both bees and butterflies use the flowers as a nectar source.